Burr Brown Corporation ADS7817PB, ADS7817P, ADS7817EC-2K5, ADS7817EC-250, ADS7817EC Datasheet

ADS7817

DESCRIPTION

The ADS7817 is a 12-bit, 200kHz sampling analog­to-digital converter (A/D) that features a high imped­ance fully differential analog input. The reference
voltage can be varied from 100mV to 2.5V, with a
corresponding input-referred resolution between 49µV
and 1.22mV.

The differential input, low power, automatic power
down, and small size make the ADS7817 ideal for
direct connection to transducers in battery operated
systems, remote data acquisition, or multi-channel
applications. The ADS7817 is available in a plastic
mini-DIP-8, an SOIC-8, or an MSOP-8 package.

12-Bit Differential Input Micro Power Sampling

ANALOG-TO-DIGITAL CONVERTER

®

©

1997 Burr-Brown Corporation PDS-1369B Printed in U.S.A., May, 2000

FEATURES

● BIPOLAR INPUT RANGE

● TRUE DIFFERENTIAL INPUT

● 200kHz SAMPLING RATE

● MICRO POWER: 2.3mW at 200kHz

● POWER DOWN: 3µA Max

● AVAILABLE IN MSOP-8 PACKAGE

● SERIAL INTERFACE

● AC COMMON-MODE REJECTION

SAR

Control

Serial

Interface

D

OUT

Comparator

S/H Amp

CS/SHDN

DCLOCK

+In

V

REF

–In

CDAC

OPA658

ADS7817

ADS7817

APPLICATIONS

● TRANSDUCER INTERFACE

● BATTERY OPERATED SYSTEMS

● REMOTE DATA ACQUISITION

● ISOLATED DATA ACQUISITION

● AC MOTOR CONTROL

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone]

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

For most current data sheet and other product

information, visit www.burr-brown.com

2

®

ADS7817

SPECIFICATIONS

At –40°C to +85°C, +VCC = +5V, V

REF

= +2.5V, f

SAMPLE

= 200kHz, f

CLK

= 16 • f

SAMPLE

, –In = +2.5V, unless otherwise specified.

ADS7817 ADS7817B ADS7817C

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT

Full-Scale Input Span +In – (–In) –V

REF

+V

REF

✻✻✻✻V

Absolute Input Voltage +In –0.3 V

CC

+0.3 ✻✻✻✻V

–In –0.3 4 ✻✻✻✻V
Capacitance 15 ✻✻pF
Leakage Current ±1 ✻✻µA

SYSTEM PERFORMANCE

Resolution 12 ✻✻Bits
No Missing Codes 11 12 ✻ Bits
Integral Linearity Error ±1 ±2 ±0.8 ±2 ±0.5 ±1 LSB

(1)

Differential Linearity Error ±1 ±2 ±0.7 ±1 ±0.4 ±1 LSB
Offset Error ±1 ±6 ✻✻ ✻✻LSB
Gain Error ±0.5 ±4 ✻✻ ✻✻LSB
Noise 63 ✻✻µVrms
Common-Mode Rejection 80 ✻✻dB
Power Supply Rejection 82 ✻✻dB

SAMPLING DYNAMICS

Conversion Time 12 ✻✻

Clk Cycles

Acquisition Time 1.5 ✻✻

Clk Cycles

Throughput Rate 200 ✻✻kHz

DYNAMIC CHARACTERISTICS

Total Harmonic Distortion V

IN

= 5.0Vp-p at 1kHz –83 ✻✻dB

V

IN

= 5.0Vp-p at 5kHz –81 ✻✻dB

SINAD V

IN

= 5.0Vp-p at 1kHz 71 ✻✻dB

Spurious Free Dynamic Range V

IN

= 5.0Vp-p at 1kHz 86 ✻✻dB

REFERENCE INPUT

Voltage Range 0.1 2.5 ✻✻✻✻V
Resistance CS = V

CC

5 ✻✻GΩ

CS = GND, f

SAMPLE

= 0Hz

5 ✻✻GΩ

Current Drain At Code FF8h 20 100 ✻✻ ✻✻µA

f

SAMPLE

= 12.5kHz

1.3 20 ✻✻ ✻✻µA

CS = V

CC

0.001 3 ✻✻ ✻✻µA

DIGITAL INPUT/OUTPUT

Logic Family CMOS ✻✻
Logic Levels:

V

IH

IIH = +5µA3

+V

CC

+0.

3 ✻✻✻✻V

V

IL

IIL = +5µA –0.3 0.8 ✻✻✻✻V

V

OH

IOH = –250µA 3.5 ✻✻V

V

OL

IOL = 250µA 0.4 ✻✻V

Data Format Binary Two’s Complement ✻✻

POWER SUPPLY REQUIREMENTS

V

CC

Specified Performance 4.75 5.25 ✻✻✻✻V

Quiescent Current 460 800 ✻✻ ✻✻µA

f

SAMPLE

= 12.5kHz

(2, 3)

40 ✻✻µA

f

SAMPLE

= 12.5kHz

(3)

330 ✻✻µA

Power Down CS =V

CC

, f

SAMPLE

= 0Hz 3 ✻✻µA

TEMPERATURE RANGE

Specified Performance –40 +85 ✻✻✻✻°C

✻ Specifications same as ADS7817.

NOTE: (1) LSB means Least Significant Bit, with V

REF

equal to +2.5V, one LSB is 1.22mV. (2) f

CLK

= 3.2MHz, CS = VCC for 241 clock cycles out of every 256.

(3) See the Power Dissipation section for more information regarding lower sample rates.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.

3

®

ADS7817

ELECTROSTATIC
DISCHARGE SENSITIVITY

Electrostatic discharge can cause damage ranging from per­formance degradation to complete device failure. Burr­Brown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.

ESD damage can range from subtle performance degrada­tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet
published specifications.

ABSOLUTE MAXIMUM RATINGS

(1)

+VCC.....................................................................................................+6V

Analog Input ...........................................................–0.3V to (+V

CC

+ 0.3V)

Logic Input ............................................................. –0.3V to (+V

CC

+ 0.3V)

Case Temperature ......................................................................... +100°C

Junction Temperature .................................................................... +150°C

Storage Temperature..................................................................... +125°C

External Reference Voltage .............................................................. +5.5V

NOTE: (1) Stresses above these ratings may permanently damage the device.

PIN CONFIGURATION

PIN ASSIGNMENTS

PIN NAME DESCRIPTION

1V

REF

Reference Input.
2 +In Non Inverting Input.
3 –In Inverting Input.
4 GND Ground.
5 CS/SHDN Chip Select when LOW, Shutdown Mode when HIGH.
6D

OUT

The serial output data word is comprised of 12 bits of data. In operation the data is valid on the falling edge of DCLOCK. The

second clock pulse after the falling edge of CS enables the serial output. After one null bit the data is valid for the next 12 edges.
7 DCLOCK Data Clock synchronizes the serial data transfer and determines conversion speed.

8+V

CC

Power Supply.

1
2
3
4

8
7
6
5

+V

CC

DCLOCK
D

OUT

CS/SHDN

V

REF

+In

–In

GND

ADS7817

PDIP-8,
SOIC-8,
MSOP-8

PACKAGE/ORDERING INFORMATION

MAXIMUM MAXIMUM
INTEGRAL DIFFERENTIAL
LINEARITY LINEARITY PACKAGE SPECIFICATION

ERROR ERROR DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT (LSB) (LSB) PACKAGE NUMBER

(1)

RANGE MARKING

(2)

NUMBER

(3)

MEDIA

ADS7817P ±2 ±2 MSOP-8 006 –40°C to +85°C ADS7817P ADS7817P Rails
ADS7817U ±2 ±2 MSOP-8 182 –40°C to +85°C ADS7817U ADS7817U

"

ADS7817U """"""ADS7817U/2K5 Tape and Reel
ADS7817E ±2 ±2 MSOP-8 337 –40°C to +85°C A17 ADS7817E Rails
ADS7817E

""""""ADS7817E/250 Tape and Reel

ADS7817E

""""""ADS7817E/2K5 "

ADS7817PB ±2 ±1 Plastic DIP-8 006 –40°C to +85°C ADS7817PB ADS7817PB Rails
ADS7817UB ±2 ±1 Plastic DIP-8 182 –40°C to +85°C ADS7817UB ADS7817UB

"

ADS7817UB """"""ADS7817UB/2K5 Tape and Reel
ADS7817EB ±2 ±1 SOIC-8 337 –40°C to +85°C A17 ADS7817EB Rails
ADS7817EB

""""""ADS7817EB/250 Tape and Reel

ADS7817EB

""""""ADS7817EB/2K5 "

ADS7817PC ±1 ±0.75 SOIC-8 006 –40°C to +85°C ADS7817PC ADS7817PC Rails
ADS7817UC ±1 ±0.75 SOIC-8 182 –40°C to +85°C ADS7817UC ADS7817UC

"

ADS7817UC """"""ADS7817UC/2K5 Tape and Reel
ADS7817EC ±1 ±0.75 SOIC-8 337 –40°C to +85°C A17 ADS7817EC Rails
ADS7817EC

""""""ADS7817EC/250 Tape and Reel

ADS7817EC

""""""ADS7817EC/2K5 "

NOTE: (1) For detail drawing and dimension table, please see end of data sheet or Package Drawing File on Web. (2) Performance Grade information is marked
on the reel. (3) Models with a slash(/) are available only in Tape and reel in quantities indicated (e.g. /250 indicates 250 units per reel, /2K5 indicates 2500 devices
per reel). Ordering 2500 pieces of ”ADS7817E/2K5“ will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to the
www.burr-brown.com web site under Applications and Tape and Reel Orientation and Dimensions.

4

®

ADS7817

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VCC = +5V, V

REF

= +2.5V, f

SAMPLE

= 200kHz, and f

CLK

= 16 • f

SAMPLE

, –In = +2.5V, unless otherwise specified.

CHANGE IN OFFSET vs REFERENCE VOLTAGE

5

4.5
4

3.5
3

2.5
2

1.5
1

0.5
0

Change in Offset (LSB)

1.0 1.25 1.5 1.75 2.252.0 2.5
Reference Voltage (V)

CHANGE IN GAIN vs REFERENCE VOLTAGE

4

3.5
3

2.5
2

1.5
1

0.5
0

Change in Gain (LSB)

Reference Voltage (V)

1.0 1.25 1.5 1.75 2.252.0 2.5

CHANGE IN OFFSET vs TEMPERATURE

1.2

0.8

0.4

0.0

–0.4

–0.8

–1.2

Delta from 25°C (LSB)

–50 –25 0 25 50 75 100

Temperature (°C)

CHANGE IN GAIN vs TEMPERATURE

0.15

0.1

0.05

0

–0.05

–0.1

–0.15

Delta from 25°C (LSB)

–50 –25 0 25 50 75 100

Temperature (°C)

12.0

11.5

11.0

10.5

10.0

9.5

9.0

EFFECTIVE NUMBER OF BITS

vs REFERENCE VOLTAGE

Reference Voltage

0.1 1 10

Effective Number of Bits

18

15

12

9

6

3

0

PEAK-TO-PEAK NOISE vs REFERENCE VOLTAGE

Reference Voltage

0.1 1 10

Peak-to-Peak Noise (LSB)

5

®

ADS7817

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VCC = +5V, V

REF

= +2.5V, f

SAMPLE

= 200kHz, and f

CLK

= 16 • f

SAMPLE

, –In = +2.5V, unless otherwise specified.

73

72

71

70

69

68

67

SIGNAL-TO-NOISE RATIO AND

SIGNAL-TO-(NOISE+DISTORTION)

vs INPUT FREQUENCY

Input Frequency (kHz)

1 10 100

SNR and SINAD (dB)

SNR

SINAD

80

70

60

50

40

30

20

10

SIGNAL-TO-(NOISE+DISTORTION)

vs INPUT LEVEL

Input Level (dB)

–60 –50 –40 –30 –10–20 0

SINAD (dB)

POWER SUPPLY REJECTION vs RIPPLE FREQUENCY

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

Power Supply Rejection (dB)

1 10 100 1000 10000

Ripple Frequency (kHz)

FREQUENCY SPECTRUM

(4096 Point FFT; f

IN

= 9.9kHz, –0.5dB)

0

–20

–40

–60

–80

–100

–120

Amplitude (dB)

0 255075100

Frequency (kHz)

95

90

85

80

75

70

65

SPURIOUS FREE DYNAMIC RANGE AND

TOTAL HARMONIC DISTORTION

vs INPUT FREQUENCY

Input Frequency (kHz)

1 10 100

SFDR (dB)

–95

–90

–85

–80

–75

–70

–65

THD (dB)

SFDR

THD

CHANGE IN INTEGRAL LINEARITY and DIFFERENTIAL

LINEARITY vs SAMPLE RATE

1.5

1.0

0.5

0

–0.5

Delta from f

SAMPLE

= 200kHz (LSB)

0 80 160 240 320 400

Sample Rate (kHz)

Change in Integral

Linearity (LSB)

Change in Differential

Linearity (LSB)